
The first release of WSL provides a Linux-compatible kernel interface developed by Microsoft, containing no Linux kernel code, which can then run a GNU user space on top of it, such as that of Ubuntu, openSUSE, SUSE Linux Enterprise Server, Debian and Kali Linux. It can be installed either by joining the Windows Insider program or manual install. WSL is not available to all Windows 10 users by default. Since June 2019, WSL 2 is available to Windows 10 customers through the Windows Insider program, including the Home edition. In May 2019, WSL 2 was announced, introducing important changes such as a real Linux kernel, through a subset of Hyper-V features. Windows Subsystem for Linux ( WSL) is a compatibility layer for running Linux binary executables (in ELF format) natively on Windows 10, Windows 11, and Windows Server 2019.

Linux kernel: GNU GPLv2 (only) with some code under compatible GPL variants or under permissive licenses like BSD, MITĭocs. Subsystem: Proprietary commercial software Windows 10, Windows Server 2019, Windows 11
